Factory Direct Independent Coil Spring Unit for Sofa Chair Seat with Free Sample for Wholesale Buyers Our premium pocket spring unit is engineered with precision to deliver exceptional support and comfort for mattress manufacturing. Product Specifications Product Name Pocket Spring Unit For Sale Material High Carbon Steel Wire Wire Diameter 1.0mm-2.3mm Head Diameter 4-6.5cm Middle Diameter 4.5-7.5cm Height 6-25cm Turns 4-7 Turns Coils Counts According to client requirements